Abstract:
:Microdeletions of 3q29 have previously been reported, but the postulated reciprocal microduplication has only recently been observed. Here, cases from four families, two ascertained in Toronto (Canada) and one each from Edinburgh (UK) and Leiden (Netherlands), carrying microduplications of 3q29 are presented. These families have been characterized by cytogenetic and molecular techniques, and all individuals have been further characterized with genome-wide, high density single nucleotide polymorphism (SNP) arrays run at a single centre (The Centre for Applied Genomics, Toronto). In addition to polymorphic copy-number variants (CNV), all carry duplications of 3q29 ranging in size from 1.9 to 2.4 Mb, encompassing multiple genes and defining a minimum region of overlap of about 1.6 Mb bounded by clusters of segmental duplications that is remarkably similar in location to previously reported 3q29 microdeletions. Consistent with other reports, the phenotype is variable, although developmental delay and significant ophthalmological findings were recurrent, suggesting that dosage sensitivity of genes located within 3q29 is important for eye and CNS development. We also consider CNVs found elsewhere in the genome for their contribution to the phenotype. We conclude by providing preliminary guidelines for management and anticipatory care of families with this microduplication, thereby establishing a standard for CNV reporting.
journal_name
Cytogenet Genome Resjournal_title
Cytogenetic and genome researchauthors
Goobie S,Knijnenburg J,Fitzpatrick D,Sharkey FH,Lionel AC,Marshall CR,Azam T,Shago M,Chong K,Mendoza-Londono R,den Hollander NS,Ruivenkamp C,Maher E,Tanke HJ,Szuhai K,Wintle RF,Scherer SWdoi
10.1159/000184693subject
Has Abstractpub_date
2008-01-01 00:00:00pages
65-78issue
1-4eissn
1424-8581issn
1424-859Xpii
000184693journal_volume
123pub_type
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